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$139 Cheap Flights from San Antonio (SAT) to St. Louis (STL)

View $139 flight on Mon, Oct 5, 2026Opens in a new window

Popular airlines from San Antonio International Airport (SAT) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from San Antonio to St. Louis (SAT-STL)

Prices were available within the past 7 days and start at $139 for one-way flights and $250 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Sep 23 - Thu, Oct 1
SAT
San Antonio
STL
St. Louis
$250 Roundtrip, found 3 days ago
$250
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Sep 23 from San Antonio to St. Louis, returning Thu, Oct 1, priced at $250 found 3 days ago
Frontier Airlines
Mon, Sep 28 - Wed, Sep 30
SAT
San Antonio
STL
St. Louis
$251 Roundtrip, found 3 days ago
$251
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Mon, Sep 28 from San Antonio to St. Louis, returning Wed, Sep 30, priced at $251 found 3 days ago
Frontier Airlines
Wed, Sep 23 - Fri, Oct 2
SAT
San Antonio
STL
St. Louis
$252 Roundtrip, found 3 days ago
$252
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Sep 23 from San Antonio to St. Louis, returning Fri, Oct 2, priced at $252 found 3 days ago
Frontier Airlines
Fri, Oct 2 - Fri, Oct 9
SAT
San Antonio
STL
St. Louis
$262 Roundtrip, found 6 days ago
$262
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Oct 2 from San Antonio to St. Louis, returning Fri, Oct 9, priced at $262 found 6 days ago
Frontier Airlines
Wed, Dec 9 - Mon, Dec 14
SAT
San Antonio
STL
St. Louis
$268 Roundtrip, found 1 day ago
$268
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Dec 9 from San Antonio to St. Louis, returning Mon, Dec 14, priced at $268 found 1 day ago
Frontier Airlines
Fri, Dec 4 - Mon, Dec 7
SAT
San Antonio
STL
St. Louis
$270 Roundtrip, found 3 days ago
$270
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Dec 4 from San Antonio to St. Louis, returning Mon, Dec 7, priced at $270 found 3 days ago
Southwest Airlines
Mon, Nov 2 - Thu, Nov 5
SAT
San Antonio
STL
St. Louis
$303 Roundtrip, found 2 days ago
$303
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Mon, Nov 2 from San Antonio to St. Louis, returning Thu, Nov 5, priced at $303 found 2 days ago
Delta
Thu, Nov 12 - Thu, Nov 19
SAT
San Antonio
STL
St. Louis
$323 Roundtrip, just found
$323
Roundtrip
just found
Select Delta flight, departing Thu, Nov 12 from San Antonio to St. Louis, returning Thu, Nov 19, priced at $323 just found
United
Mon, Oct 26 - Mon, Nov 2
SAT
San Antonio
STL
St. Louis
$362 Roundtrip, just found
$362
Roundtrip
just found
Select United flight, departing Mon, Oct 26 from San Antonio to St. Louis, returning Mon, Nov 2, priced at $362 just found
American Airlines
Mon, Oct 26 - Mon, Nov 2
SAT
San Antonio
STL
St. Louis
$367 Roundtrip, just found
$367
Roundtrip
just found
Select American Airlines flight, departing Mon, Oct 26 from San Antonio to St. Louis, returning Mon, Nov 2, priced at $367 just found

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $493
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $493

Find the cheapest month to fly from San Antonio (SAT) to St. Louis (STL)

February is typically the cheapest month to fly

From $145 - $308 per traveler.

What you need to know for your flight from San Antonio Intl. to Lambert-St. Louis Intl.

San Antonio (SAT) to St. Louis (STL) at a glance

Travel to St. Louis (STL) from San Antonio (SAT) with a range of airlines offering this domestic short-haul journey. Discover options for cheap flights from San Antonio as well as weekly flights to help you find an itinerary that aligns with your budget and schedule. Enjoy exploring the iconic sights and vibrant neighborhoods of St. Louis while you choose from various carriers, whether you prefer full-service or low-cost options. Get ready for your adventure with essential details about flights from San Antonio International Airport to Lambert-St. Louis International Airport.

  • Fastest flight duration: around 2h 15m non-stop
  • Route distance: roughly 800 miles (1,290 km)
  • Flights per week: around 15+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $100–$415, depending on seasonality and how far ahead you book

Flights from San Antonio International Airport (SAT) to Lambert-St. Louis International Airport (STL)

According to recent traveler bookings, here are the top airlines preferred for routes from San Antonio to St. Louis, featuring both non-stop and one-stop flights. Popular layover options include Dallas-Fort Worth International Airport (DFW) with about a 1-hour layover, George Bush Intercontinental Airport (IAH) at around 1 hour and 15 minutes, and Hartsfield-Jackson Atlanta International Airport (ATL), also approximately 1 hour and 15 minutes. This variety allows you to mix and match based on price, total travel time, and cabin class to find your ideal itinerary.

  • Southwest Airlines: Known for its budget-friendly fares, this low-cost airline provides both non-stop and one-stop options. One-way tickets generally fall between $100 and $475, and it represents around 38% of flights on this route, with a typical non-stop travel time of 2 hours and 15 minutes.
  • American Airlines: This full-service airline offers one-stop journeys, with one-way prices usually ranging from $100 to $395. It accounts for about 36% of departures on this route, featuring an in-flight duration of 3 hours and 15 minutes, leading to a total travel time of approximately 4 hours and 30 minutes when layovers are included.
  • United: Another full-service option, United provides one-stop flights priced between $110 and $425 for one-way tickets. It captures around 15% of the route's departures, with a flight time of 3 hours and 15 minutes and an overall journey time of roughly 4 hours and 30 minutes, including layover time.
  • Delta: This full-service carrier offers one-stop services with fares typically ranging from $100 to $350 for one-way travel. Delta accounts for about 8% of the total departures on this route, featuring an in-flight duration of 3 hours and 15 minutes, culminating in a total journey time of around 4 hours and 30 minutes when factoring in layovers.
  • Frontier Airlines: A low-cost option that provides one-stop service, Frontier's one-way fares generally range from $100 to $215. It makes up about 2% of departures on this route and has an in-flight time of 3 hours and 15 minutes, resulting in a total travel time of approximately 4 hours and 30 minutes when including layovers.

Travelers flying from San Antonio to St. Louis can enhance their experience by upgrading to first-class service offered by United on this route.

Best time to fly from San Antonio (SAT) to St. Louis (STL)

The most popular months for travelers flying from San Antonio to St. Louis are February, March, and April, when peak temperatures in St. Louis reach up to 56.1°F in April. If you prefer quieter travel, consider August, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 77°F. For better deals, February usually offers the lowest average one-way fare around $189. Flight availability peaks in November, with approximately 18 flights per week, making it easier to find convenient departure times. January has the fewest flights, with approximately 12 flights per week.

  • Cheapest time to fly: February usually offers good deals with average one-way fare around $189, roughly 10% cheaper than the yearly average.
  • More budget-friendly months to fly: August, May, and January typically offer average one-way fares of around $200.
  • Most flight options: November has the highest number of flights from San Antonio to St. Louis, with approximately 18 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Average12$202
February34.9°F (1.6°C)Moderately High17$189
March46.4°F (8.0°C)Moderately High17$224
April56.1°F (13.4°C)Moderately High14$232
May66.6°F (19.2°C)Average17$200
June76.1°F (24.5°C)Average15$215
July78.6°F (25.9°C)Average15$204
August77.0°F (25.0°C)Moderately Low14$198
September70.9°F (21.6°C)Average17$220
October58.6°F (14.8°C)Moderately Low14$244
November46.2°F (7.9°C)Moderately Low18$205
December37.8°F (3.2°C)Average17$217

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from San Antonio (SAT) to St. Louis (STL)

  • Austin to St. Louis (AUS-STL): Austin-Bergstrom International Airport (AUS) lies approximately 67 miles from San Antonio International Airport (SAT). One-way economy fares for this route generally fall within the range of $90 to $385, influenced by the season and the timing of your booking. Travelers can choose between both non-stop and one-stop flights. Major airlines operating on this route include Southwest Airlines, known for its budget-friendly options, and American Airlines. Additionally, there are first-class service options available on this route.

How to find the best prices for flights from San Antonio (SAT) to St. Louis (STL)

Getting some of the best deals on flights from San Antonio to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are generally available when booking at least 2 months in advance, although most travelers tend to book 2-8 weeks ahead. Morning departures between 5 AM and 12 PM usually offer lower prices and are also the most popular times to fly. Additionally, flying on Wednesday often results in cheaper rates, while Friday remains the most popular travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from San Antonio International Airport

St. Louis welcomes travelers from San Antonio with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is conveniently located just 0.1 miles away on foot, providing easy access to public transportation.

Frequently asked questions

How much does a flight from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $139 and cheap return flights from $250 San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights generally range between $160 and $849, and roundtrip flights usually range from $320 to $2102. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
January is the cheapest month to fly from San Antonio to St. Louis, with average return fares around $308. This is about 21% lower than the average price throughout the year, as travel demand typically decreases after the holiday season. Other budget-friendly months for this route include February and August.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter SAT to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from San Antonio, TX (SAT) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN also offers the most daily flights from SAT to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For flights from San Antonio (SAT) to St. Louis (STL), January and February are the best months to fly. Both months offer lower average prices, with January averaging around $308 for a return flight. These months are ideal as they provide a balance of cost and availability, allowing you to enjoy your trip without the crowds. This information is based on booking data from the past year.*Prices based on flights available on Expedia in the last year.
How many flights per day from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are approximately 2 nonstop flights per day from San Antonio Intl. (SAT) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from San Antonio International Airport (SAT) to Lambert-St. Louis International Airport (STL) typically departs at around 5:00 AM, operated by American Airlines. An early departure like this can help you maximize your time in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from San Antonio Intl. (SAT) to Lambert-St. Louis Intl. (STL) are in the early morning, from 6am to 9am. About 24% of passengers prefer this time window. Many major carriers, including American Airlines, Southwest Airlines, and Delta, offer flights during this window. This timing works well because it allows you to start your day early and arrive in St. Louis with plenty of time to explore.
How long does it take to fly from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A nonstop flight from SAT to STL typically takes around 2 hours 20 minutes, covering approximately 787 miles. Connecting flights on this route usually add 3 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Select the "Business class" and "First class" filters when looking for SAT to STL flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from San Antonio Intl. (SAT)?
If you're planning to travel to St. Louis from San Antonio Intl. (SAT), you can fly into Lambert-St. Louis Intl. (STL) Some flights may connect through major hubs like George Bush Intercontinental (IAH), Love Field (DAL), William P. Hobby (HOU) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your San Antonio, TX (SAT-San Antonio Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
San Antonio Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$250
Distance
786 mi
Average flight time
2 hours 8 mins

Book with confidence

San Antonio to St. Louis Flights

The cheapest times to fly from San Antonio to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Antonio to St. Louis are during the month of September. You can find some of the cheapest flights from San Antonio to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Antonio to St. Louis

Sunday is one of the best days to book for cheap flights from San Antonio to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Antonio to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Antonio to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $139 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Antonio to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Antonio to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Antonio to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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